When you exercise, your heart rate is elevated for the period of the exercise, usually just a short period of time. Short bursts of an elevated heart rate make your heart more efficient while it rests, so that it is ready for next time.
However, when you take drugs that elevate your heart rate, it remains elevated for a much longer period of time. Your body isn’t given enough of a rest period to become stronger, and the duration is enough to put your heart under strain which causes problems.
Exercise can cause heart problems, too! Long vigorous exercise can be harmful to your body, and it’s not uncommon for people running marathons and such to have heart complications
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